I've been feeling under the weather the past two days and took today off work to try and get feeling better. Went out today and jumped the female connector. The gauge went up to full. I assume this likely means the sending unit is bad unless I have a cut wire somewhere. Given that I have to empty the tank and lift it from the bike to replace the unit, I may just live with it for a while. Is it as big a pain in the a$$ as I imagine it is to change it? Trying to think of how I could check for a wiring problem to see if it actually is the sending unit. My brain is not working well right now due to my current illness. Suggestions? Thanks for the help thus far. It is greatly appreciated.
Now you know that the gauge and the power that drives it are fine. The only other thing in this circuit is the sender itself, and that
is the other side of the connector that you used the jumper on.
If you have an ohmmeter, you can measure across the male (spade) terminals in that connector to verify if the sender is bad. Depending on the amount of fuel in the tank, you should get different ohm readings if the sender is good. This test is done without the key on
If the tank is full, the ohmmeter should read around 4 to 10 ohms. (use the ohms x 1 scale)
If the tank is near empty, the reading should be closer to 100 ohms. (use the ohms x10 scale)
So, any reading between 4 and 100 ohms will indicate that the sender is OK.
But, since you are getting an empty reading when everything is hooked up, you will most likely be seeing an infinite, or open condition at this connector.
The wiring in question is only from that connector to the tank sensor, so unless you can see an obvious wiring break, you could reasonably assume the sender is bad.